Stout canes and tied in regularly with raffia. Otherwise 2 uprights and a top bar and plant your toms with long lengths of string..........as the toms grow up twist the stems around the string and tie in to top bar.

In my experience, ericaceous compost tends to be almost dust like and dries out very quickly (particularly in a pot ). Check that it hasn't dried out and/or that it is not root bound first. Then follow the advice for growing these plants and see whether you feel it is worth it or not.